AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
UINavigationController *nav =[[UINavigationController alloc]initWithRootViewController:[[ViewController alloc]init]];
self.window.rootViewController =nav;
[self.window makeKeyAndVisible];
return YES;
}ViewController.m
#import "ViewController.h"
#import "View2Controller.h"
@interface ViewController ()<UIPopoverControllerDelegate>
@property (nonatomic,strong) UIPopoverController *popoverButtonItem;
@property (nonatomic,strong) UIPopoverController *popoverButton;
@end
@implementation ViewController
//popoverButtonItem懒加载
-(UIPopoverController *) popoverButtonItem{
if (!_popoverButtonItem) {
UINavigationController *nav= [[UINavigationController alloc]initWithRootViewController: [[View2Controller alloc]init]];
_popoverButtonItem= [[UIPopoverController alloc] initWithContentViewController:nav];
_popoverButtonItem.delegate = self;
}
return _popoverButtonItem;
}
//popoverButton懒加载
-(UIPopoverController *) popoverButton{
if (!_popoverButton) {
_popoverButton= [[UIPopoverController alloc] initWithContentViewController:[[View2Controller alloc]init]];
_popoverButton.delegate = self;
}
return _popoverButton;
}
//1. 从BarButtonItem点击弹出
-(void) touchButtonItem:(UIBarButtonItem *)btn {
/**
* 从BarButtonItem上点击
* @param item:围绕着哪个UIBarButtonItem显示
* @param permittedArrowDirections:箭头指的方向
* @param animated:动画
*/
[self.popoverButtonItem presentPopoverFromBarButtonItem:btn permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}
//2从界面上的某个按钮或者某片区域弹出popOver，排除navigationBar或者TabBar上的点击
-(void) touchButton:(UIButton *)btn {
/**
* 从界面上的某个按钮或者某片区域弹出popOver
* @param presentPopoverFromRect: 指定箭头所指区域的矩形框范围（位置和尺寸）
* @param inView: rect参数是以view的左上角为坐标原点（0，0）
* @param permittedArrowDirections:箭头指的方向
* @param animated:动画
*/
[self.popoverButton presentPopoverFromRect:btn.bounds
inView:btn
permittedArrowDirections:UIPopoverArrowDirectionLeft
animated:YES];
}
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor grayColor];
self.navigationItem.title = @"导航栏";
self.navigationItem.leftBarButtonItem =[[UIBarButtonItem alloc]initWithTitle:@"点我" style:UIBarButtonItemStyleDone target:self action:@selector(touchButtonItem:)];
//********************************************************************************
UIButton *btn =[[UIButton alloc]initWithFrame:CGRectMake(, , , )];
[btn setTitle:@"点我啊" forState:UIControlStateNormal];
[btn setTintColor:[UIColor blueColor]];
[btn setBackgroundColor:[UIColor redColor]];
[btn addTarget:self action:@selector(touchButton:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
// UIPopoverControllerDelegate --在ARC环境下正确的做法是保持popover的生命周期。让popover是strong类型的成员变量或属性。 当收到UIPopoverController dismiss的消息的时候将popover＝nil;这样就可以正常便用了。
- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController
{
self.popoverButton = nil;
self.popoverButtonItem = nil;
}View2Controller.m
- (void)viewDidLoad
{
[super viewDidLoad];
// 设置控制器在popover中显示的尺寸 跟 view 一样
self.preferredContentSize = self.view.frame.size;
}